DTC C1380: Stop Light Control Relay Malfunction [12/2017 - 09/2018]: Description

When the brake hold system or dynamic radar cruise control system operates, the skid control ECU (brake actuator assembly) turns ON the stop light drive output (STPO) to operate the No. 3 semiconductor power integration ECU and illuminate the stop light.

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
C1380	Stop Light Control Relay Malfunction	When the voltage at terminal +BS is 9.5 V or higher, stop light drive output (STPO) is ON and STP2 is OFF for 5 seconds or more. When the voltage at terminal +BS is 9.5 V or higher, stop light drive output (STPO) is OFF and input signals for STP and STP2 differ for 5 seconds or more.	Wire harness or connector Rear light LED LH Rear light lens and body LH Rear light LED RH Rear light lens and body RH Rear combination light LED LH Rear combination light lens and body LH Rear combination light LED RH Rear combination light lens and body RH Center stop light assembly Center stop light wire Stop light switch assembly No. 3 semiconductor power integration ECU Skid control ECU (Brake actuator assembly)	-

C1380 DTC DETECTION CONDITIONS

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	-	-	-
Malfunction Status	When the voltage at terminal +BS is 9.5 V or higher, stop light drive output (STPO) is ON and STP2 is OFF for 5 seconds or more.	◦	-
Malfunction Status	When the voltage at terminal +BS is 9.5 V or higher, stop light drive output (STPO) is OFF and input signals for STP and STP2 differ for 5 seconds or more.	-	◦
Detection Time		5 seconds or more.	5 seconds or more.
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.